Geometry module for next-generation computational electromagnetics software

in Proceedings of the 4th Advanced Computational Electromagnetics workshop (2009, January 13)

Analysis of perforated magnetic shields for electric power applications

in IET Electric Power Applications (2009), 3(2), 123-132

The shielding performance of perforated magnetic shields for electric power applications is described. The shielding of an axisymmetric induction heating device is studied as a function of frequency ... [more ▼]

The shielding performance of perforated magnetic shields for electric power applications is described. The shielding of an axisymmetric induction heating device is studied as a function of frequency, number of perforations and dimensions of the perforations. From the numerical point of view, the perforations cause the numerical model to be 3D. A numerical optimisation is carried out to find the optimal geometry with respect to the shielding factor and the volume of the shield. For the optimisation, two approaches are presented. The first approach is fast and easy-to-implement, but has limited accuracy. It uses a classical 2D axisymmetric model where the perforations are approximated by ‘axisymmetric air gaps’ resulting in a segmented shield. It is shown how to modify the 2D model to obtain results that are similar to the ones of a 3D model. The second approach is more accurate although quite fast, but more difficult to implement. It combines a 3D thin- shell finite element model with the unmodified 2D model in a space mapping optimisation algorithm. The validation of both models is based on experimental work for an unperforated shield and for the optimised perforated shield. [less ▲]

Direct Inclusion of Proximity-Effect Losses in Two-Dimensional Time-Domain Finite-Element Simulation of Electrical Machines

in Proceedings of the 8th International Symposium on Electric and Magnetic Fields (EMF2009) (2009)

This paper deals with eddy-current effects in the distributed winding of electrical machines, and in particular with the proximity effect and the associated losses. A previously proposed homogenization ... [more ▼]

This paper deals with eddy-current effects in the distributed winding of electrical machines, and in particular with the proximity effect and the associated losses. A previously proposed homogenization method for windings in two-dimensional (2D) time-domain finite-element (FE) models is shown to be applicable without additional computational cost, producing a precise estimate of the instantaneous proximity-effect losses. The method is illustrated by considering the conductors in a single stator slot of a 3kW induction motor. The brute-force model, with fine discretisation of each conductor, and the homogenized model yield macroscopic results that are very close to each other. [less ▲]

Dual Approach for Electromechanical Coupling in MEMS

(2009)

In this paper we present an approach for the computation of coupled electromechanical problems in micro-electromechanical systems based on a vector potential formulation of the electrostatic problem. This ... [more ▼]

In this paper we present an approach for the computation of coupled electromechanical problems in micro-electromechanical systems based on a vector potential formulation of the electrostatic problem. This formulation is the dual of the scalar potential approach commonly used in the literature. We present an analytic derivation of the force computed using this dual method based on the virtual work principle, and compare the primal and dual approaches on the finite element solution of simple twodimensional test-cases. [less ▲]

High quality meshing based on harmonic mappings for biomedical simulation

in Proceedings of the 1st International Conference on Mathematical and Computational Biomedical Engineering (CMBE2009) (2009)

Gmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities

in Proceedings of the 11th International Society of Grid Generation Conference (ISSG 2009) (2009)

Generalized Cloaking and Optical Polyjuice

in Proceedings of the 8th International Symposium on Electric and Magnetic Fields (EMF'2009) (2009)

Curvilinear mesh generation for CFD

in Proceedings of the 11th International Society of Grid Generation Conference (ISSG 2009) (2009)

Gmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities

in International Journal for Numerical Methods in Engineering (2009), 79(11), 1309-1331

Modelling earthing systems and cables with moment methods

in International Journal for Computation and Mathematics in Electrical and Electronic Engineering (2009), 28(4), 989--1004